diff --git a/hgext/rebase.py b/hgext/rebase.py
--- a/hgext/rebase.py
+++ b/hgext/rebase.py
@@ -467,6 +467,6 @@ cmdtable = {
         ('c', 'continue', False, _('continue an interrupted rebase')),
         ('a', 'abort', False, _('abort an interrupted rebase')),] +
          templateopts,
-        _('hg rebase [-s rev | -b rev] [-d rev] [--collapse] [--keep] '
+        _('hg rebase [-s REV | -b REV] [-d REV] [--collapse] [--keep] '
                             '[--keepbranches] | [-c] | [-a]')),
 }
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -3230,7 +3230,7 @@ table = {
          _('[OPTION]... PATTERN [FILE]...')),
     "heads":
         (heads,
-         [('r', 'rev', '', _('show only heads which are descendants of rev')),
+         [('r', 'rev', '', _('show only heads which are descendants of REV')),
           ('a', 'active', False,
            _('show only the active heads from open branches')),
          ] + templateopts,
@@ -3276,7 +3276,7 @@ table = {
          _('[-e CMD] [--remotecmd CMD] [DEST]')),
     "locate":
         (locate,
-         [('r', 'rev', '', _('search the repository as it stood at rev')),
+         [('r', 'rev', '', _('search the repository as it stood at REV')),
           ('0', 'print0', None,
            _('end filenames with NUL, for use with xargs')),
           ('f', 'fullpath', None,
diff --git a/tests/test-rebase-parameters.out b/tests/test-rebase-parameters.out
--- a/tests/test-rebase-parameters.out
+++ b/tests/test-rebase-parameters.out
@@ -2,7 +2,7 @@
 
 % Use continue and abort
 hg rebase: cannot use both abort and continue
-hg rebase [-s rev | -b rev] [-d rev] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
+hg rebase [-s REV | -b REV] [-d REV] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
 
 move changeset (and descendants) to a different branch
 
@@ -30,7 +30,7 @@ use "hg -v help rebase" to show global o
 
 % Use continue and collapse
 hg rebase: cannot use collapse with continue or abort
-hg rebase [-s rev | -b rev] [-d rev] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
+hg rebase [-s REV | -b REV] [-d REV] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
 
 move changeset (and descendants) to a different branch
 
@@ -58,7 +58,7 @@ use "hg -v help rebase" to show global o
 
 % Use continue/abort and dest/source
 hg rebase: abort and continue do not allow specifying revisions
-hg rebase [-s rev | -b rev] [-d rev] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
+hg rebase [-s REV | -b REV] [-d REV] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
 
 move changeset (and descendants) to a different branch
 
@@ -86,7 +86,7 @@ use "hg -v help rebase" to show global o
 
 % Use source and base
 hg rebase: cannot specify both a revision and a base
-hg rebase [-s rev | -b rev] [-d rev] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
+hg rebase [-s REV | -b REV] [-d REV] [--collapse] [--keep] [--keepbranches] | [-c] | [-a]
 
 move changeset (and descendants) to a different branch